Malicious PDF — malware analysis report

Static analysis result for SHA-256 16200f0335a33031…

MALICIOUS

PDF

97.1 KB Created: 2021-07-09 00:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00b99102923d7ba9d4c7222a268fe6a9 SHA-1: f60fddfd6f7bf85cf39f9fd592c86d90f8b48a15 SHA-256: 16200f0335a330313798e2b6fe9517c30a9916e405cf9c351b657ce0ebc95dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=baby%27s+day+out+full+movie+free
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9527460bc6---xiwazidovopixebube.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c718bb9dfd---36461094844.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40db73e75e---19235329042.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/94630921974.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b244ec02---resemovidosise.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7cbba1eb3946e768cff63c96037d0960/kimelevipugig.pdf
    • http://aarogyamedico.com/userfiles/file/38499768163.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2e1cf06b---bukapiforisi.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cee00474f6b---17858284826.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b654709fb44---duwudoxozumuw.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab3cdc011e---26283644976.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d81f0cc11---91659693449.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1f54081a866d82a87e3e8dab4fe9a278/borumajatibekelopemevizis.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/lnriqn52fhohm10fti6knhilvd/74312686422.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/grb4fpobkltasqa0qmvis097vc/gelodububoriw.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/l6h6ch34gi8mvq3fguktq8r4e6/wupevedaroladoretukiz.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1fed1a13505d4d236c33517b1583da39/96405449616.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099195631abf---negiwav.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/99745334163.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9fe678362ae0320e1c96310312e7f986/71677133921.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfd488c97---19208222113.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0fabdc73d---91621559659.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56099654b8---dexerape.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160756fa0edbeb---tubulumonota.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 16792 bytes
font_01_sfnt_off00012de8.bin
26aae4ad591e604d1d1abcd6856dddd64619ae37a480febed6ace0b73a65bd4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 17656 bytes
font_02_sfnt_off00015c11.bin
592479eb09a2b39cb2dd83afe1d128f3c971c6b3a4001760e144caf7e3bdb77b
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C11 10916 bytes